Part #'s are to the left the # in () is charlest's grit value and I fully trust his evaluation of this as he has more knowledge in his little finger than most pro shop owners in my area. He is a tremendous resource of infromation here. And if I misquoted anything I am sure he will chime in and set us both straight.--------------------He Who Dies With The Most Toys WinsRoto Grip King Of Them All !!!

My guess would be a difference in materials and therefore different ratings as far as the grit and abrasiveness goes.

I seem to recall looking at different sandpapers and comparing the grits. Some were aluminum oxide and others were silicone carbide. Even though the grits listed were the same, they were actually very different because of the ratings guidelines used for the products.

The white pads are closer to 1500 IMO and will work if you apply lots of pressure. They are a better choice for just taking the polish off a ball and not altering the grit too much since alot of polished balls come around 1000-2000 grit + polish OOB.

The blue pads don't seem to work as well as others. The ones that are used most often would be maroon(320-400),green(600),grey(800-1000).

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